Lunar Halo September 27, 2012

A lunar halo observed in Quezon City, Philippines, on September 27, 2012 Photo Credit: Anthony Urbano

A 22-degree lunar halo visible in Quezon City last night was captured with a Canon 450D DSLR, 50 mm prime lens at f/1.8, 1/3 sec exposure, ISO 1600. The halo surrounding the moon is caused by the refraction of moonlight through the edges of six-sided ice crystals in high-altitude cirrus clouds. Since blue light refracts more than red, it is always colored blue on the outside and red on the inside. Such phenomenon may also be observed around the Sun.

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© Anthony Urbano (Manila, Philippines)

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